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Power transmission control device, power transmitting device, non-contact power transmission system, electronic instrument, and power transmission control method

A technology of power transmission device and control device, applied in circuit devices, electromagnetic wave systems, battery circuit devices, etc., can solve problems such as abnormal heat generation and equipment damage, and achieve the effects of high convenience, restraint power consumption, and reduced number of components

Active Publication Date: 2009-07-15
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if power is mistakenly transmitted to non-compliant receiving-side equipment, equipment damage can occur
[0007] In addition, even in the case of power transmission to the equipment on the power receiving side that meets the standards, if the power transmission environment is not suitable, the power transmission must be stopped
For example, when transmitting power in an environment where there are metal foreign objects, there is a danger of abnormal heat generation, and power transmission must be stopped at this time

Method used

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  • Power transmission control device, power transmitting device, non-contact power transmission system, electronic instrument, and power transmission control method
  • Power transmission control device, power transmitting device, non-contact power transmission system, electronic instrument, and power transmission control method
  • Power transmission control device, power transmitting device, non-contact power transmission system, electronic instrument, and power transmission control method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0074] First, examples of preferable electronic equipment to which the present invention is applied and the principle of non-contact power transmission technology will be described.

[0075] (Example of electronic equipment and principle of non-contact power transmission)

[0076] figure 1 (A) and figure 1 (B) is an explanatory diagram for explaining an example of electronic equipment to which the non-contact power transmission method is applied and the principle of non-contact power transmission using an induction transformer.

[0077] Such as figure 1 As shown in (A), a charger (cradle) 500 serving as a power transmission side electronic device includes a power transmission device (such as a power transmission module including a power transmission side control circuit (power transmission side control IC)) 10 . Furthermore, this charger (cradle) 500 includes a display unit (LED, etc.) 16 that lights up when the charger transmits power normally.

[0078]A mobile phone 510 ...

no. 2 approach

[0165] In this embodiment, detection of an encroachment state (encroachment heat generation countermeasure) will be specifically described. The "encroachment state" is defined as a special state in which a foreign object is inserted, and refers to "the state in which the foreign object is mistaken for the power receiving side equipment and the normal power transmission continues." For example, when a thin metal plate is inserted so as to completely cover the gap between the primary coil and the secondary coil, there will always be a considerable load when viewed from the power transmission side, making removal detection difficult, for example.

[0166] (Invasion fever countermeasures)

[0167] First, the "occupied state" will be specifically described. There may be a case where, for example, a large-area foreign object is inserted between the primary coil L1 and the secondary coil L2 after the authentication of the power receiving device (or power receiving side equipment) is...

no. 3 approach

[0231] In this embodiment, recharging after full charging will be described. After being fully charged, for example, if a mobile phone terminal as a device on the power receiving side is placed on a charging stand (cradle) for a long time, the voltage drops due to discharge of the battery, and the battery becomes a state requiring recharging. Therefore, in this embodiment, the power transmission device automatically detects the necessity of recharging after it is fully charged.

[0232] (recharge after full charge)

[0233] Figure 10 (A) and Figure 10 (B) is a timing chart showing a series of operation steps for managing recharging after full charge in the contactless power transmission system. in addition, Figure 10 The steps shown in (B) are in Figure 10 The step shown in (A) is followed.

[0234] If the battery 94 (see figure 2 ) into a fully charged state, then switch to the fully charged standby mode. In this fully charged standby mode, the power transmission...

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Abstract

The present invention provides a power transmission control device, a power transmitting device, a non-contact power transmission system, an electronic instrument, and a power transmission control method. The invention may improve reliability, convenience, and reduce power consumption, size and cost of the non-contact power transmission system. A power transmission control device (20) provided in a power transmitting device (10) includes a power-transmitting-side control circuit (22) that controls power transmission to a power receiving device (40), the power-transmitting-side control circuit (22) causing the power transmitting device (10) to perform intermittent temporary power transmission, detecting a response from the power receiving device (40) that has received the power due to the temporary power transmission to automatically detect installation of a power-receiving-side instrument (510), and causing the power transmitting device (10) to perform continuous normal power transmission to the power receiving device (40) when the installation of the power-receiving-side instrument has been detected. A foreign object detection process may also be performed in combination.

Description

technical field [0001] The invention relates to a power transmission control device, a power transmission device, a non-contact power transmission system, electronic equipment, a power transmission control method and the like. Background technique [0002] In recent years, non-contact power transmission (non-contact power transmission) that can transmit electric power without contact of metal parts by using electromagnetic induction has attracted attention, and as an application example of such non-contact power transmission, proposed Charging of mobile phones or household appliances (for example, handsets of telephones or watches). [0003] A non-contact power transmission device using a primary coil and a secondary coil is described in Patent Document 1, for example. [0004] [Patent Document 1] Japanese Unexamined Patent Publication No. 2006-60909 [0005] In non-contact power transmission devices, for example, in order to extend the life of batteries (storage batteries...

Claims

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Application Information

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IPC IPC(8): H02J17/00H02J7/00H02M7/02
Inventor 大西幸太神山正之盐崎伸敬上条贵宏长谷川稔曾我部治彦
Owner SEIKO EPSON CORP
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